Difference between revisions of "LlRotBetween"
Jump to navigation
Jump to search
| Line 23: | Line 23: | ||
|notes= | |notes= | ||
This function adjusts the magnitude of the quaternion so <code>start * llRotBetween(start, end) == end</code> is true as long as neither have a magnitude of zero. They don't have to have the same magnitude. | This function adjusts the magnitude of the quaternion so <code>start * llRotBetween(start, end) == end</code> is true as long as neither have a magnitude of zero. They don't have to have the same magnitude. | ||
< | <lsl>rotation RotBetween(vector start, vector end) //adjusts quaternion magnitude so (start * return == end) | ||
rotation RotBetween(vector start, vector end) //adjusts quaternion magnitude so (start * return == end) | |||
{//Authors note: I have never had a use for this but it's good to know how to do it if I did. | {//Authors note: I have never had a use for this but it's good to know how to do it if I did. | ||
rotation rot = llRotBetween(start, end); | rotation rot = llRotBetween(start, end); | ||
| Line 32: | Line 31: | ||
{ | { | ||
float d = llSqrt(llVecMag(end) / llVecMag(start)); | float d = llSqrt(llVecMag(end) / llVecMag(start)); | ||
return <rot .x * d, rot .y * d, rot .z * d, rot .s * d>; | return <rot.x * d, rot.y * d, rot.z * d, rot.s * d>; | ||
} | } | ||
} | } | ||
return rot; | return rot; | ||
}//Strife Onizuka | }//Strife Onizuka</lsl> | ||
</ | |||
|deprecated | |deprecated | ||
|cat1=Math/3D | |cat1=Math/3D | ||
Revision as of 17:38, 6 March 2008
| LSL Portal | Functions | Events | Types | Operators | Constants | Flow Control | Script Library | Categorized Library | Tutorials |
Summary
Function: rotation llRotBetween( vector start, vector end );| 0.0 | Forced Delay |
| 10.0 | Energy |
Returns a rotation that is the rotation between the direction start and the direction end
| • vector | start | |||
| • vector | end |
Specification
start and end are directions and are relative to the origin <0.0, 0.0, 0.0>. If you have coordinates relative to a different origin, subtract that origin from the input vectors.
Caveats
start * llRotBetween(start, end) == endis only true if start and end have the same magnitude and neither have a magnitude of zero (see #Notes for a workaround).
Examples
llRotBetween(<1.0, 0.0, 0.0>, <0.0, -1.0, 0.0>) // will return <0.00000, 0.00000, -0.70711, 0.70711> (which represents -45 degrees on the z axis) llRotBetween(<0.0, 0.0, 0.0>, <0.0, -1.0, 0.0>) // will return <0.00000, 0.00000, 0.00000, 1.00000> (which represents a zero angle on all axis) // because <0.0, 0.0, 0.0> does not convey a direction.
Notes
This function adjusts the magnitude of the quaternion so start * llRotBetween(start, end) == end is true as long as neither have a magnitude of zero. They don't have to have the same magnitude.
<lsl>rotation RotBetween(vector start, vector end) //adjusts quaternion magnitude so (start * return == end)
{//Authors note: I have never had a use for this but it's good to know how to do it if I did.
rotation rot = llRotBetween(start, end);
if(start)
{
if(end)
{
float d = llSqrt(llVecMag(end) / llVecMag(start));
return <rot.x * d, rot.y * d, rot.z * d, rot.s * d>;
}
}
return rot;
}//Strife Onizuka</lsl>
See Also
Functions
| • | llAngleBetween |
Deep Notes
Signature |
|---|
function rotation llRotBetween( vector start, vector end ); |